Drawing pen



G. SCHOENNER.

DRAWINQPEN. APPLICATION FILED MAY 22, 1914. RENEWE-D JAN. 1911922.

1,412,491. Patented Aprjn, 1922.

3 SHEETS- SHEET I.

wwnmmxw G. SCHOENNER.

DRAWING PEN. v APPLICATION FILED MAY 22, 1914. RENEWED JAN. 19. i922.

1,412,491'. Patented Apr. 11, 1922.

3 SHEETS-SHEET 2 G. SCHOENNER.

DRAWING PEN. APPLICATION FILED MAY 22. 1914. RENEwIzD IAN. I9. 1922.

1,412,491. Patented Apr..11,1922.

3 SHEETS-SHEET 3.

FI @n n ej F wwwa-XW UNITED STATES PATENT OFFICE.

GEORG SCHOENNER, OF NUREMIBERG, GERMANY.

DRAWING PEN.

To Vall whom t may concern:

, Be it known that I, GEORG SGHOENNER, residing at Nuremberg, in the Empire of Germany, have invented certain new and useful Improvements in Drawing Pens, of which the following is a specilication. l

This invention relates to drawing -pens and has for its object to provide a simple and elicient pen of the kind wherein means are provided for maintaining the thickness of the line drawn constant.

In comparison with the numerous already known drawing ens provided with means for keeping the tliickness of the line drawn therewith constant, the improved pen is distinguished'by its extreme simplicity and by the fact that, during the process of cleaning, unintentional alteration in the thickness of the line is prevented.

For this purpose, in a pen according to the invention the screw threaded adjusting screw is constructed as a lockingfhook and-is associated with a Hat guide bar.v

Fig. l of the accompanying illustrative drawings shows in side elevation the nib portion of one'construction of drawing pen embodying the invention.

F ig. 2 shows the upper nib of the penY in plan. f

Fig. 3 is an internal nib of the pen, and

Fig. 4 shows the guide bar in plan.

Figs. 5, 6, 7 and 8 are similar views to Figs. l, 2, 3 and 4 respectively illustrating another construction of the improved pen.

Fig. 9 shows in side elevation and Fig. 1() in plan, a modified construction of pen according to the invention.

Figs. ll and 12 are plan views of the upper and lower nib respectively of the pen shown in Figs. 9 and 10.

Referring to Figs. l to f1, the lower nib a of the pen is formed about midway of its length with a longitudinal slot b and adjacent to the handle it is provided with an inwardly projecting guide pin c. The upper nib d of the pen is formed with a longitudinal slot e corresponding to the slot b. The set screw f is attened at its lower end and provided with a hook or extension g which preferably projects in opposite directions from the body of the screw forming a T- shaped head. Rigidly connected to the screw 7" is a Hat guide bar which at its rear end is formed with a recess z' which embraces the guide pin c forkwise. Upon the outwardly plan view of the lower Specicatou of Letters Patent.

Patented Apr. 11, 1922. Renewed January 19, 1922. Serial No. 530,491.

protruding end of the screw f is an adjusting nut /c 1n the form of a thumb wheel.

When the nut c is removed the parts are put together in the following manner. The two nibs a and d of the pen are pried apart and the hooked lower end g of the screw is passed through the longitudinal slot b, the forked end of the guide bar it being simultaneously passed over the pin c. The nut is then screwed on and the pen is then complete.

When the pen is ready for use the end of the hook is caught'over the front edge of the slotb, the pin c preventing any undesired rotation of the screw f. The-thickness of the line to be drawn with the pen is regulated by the nut 7c in the usual manner.

In order to clean the drawing pen it is held with the handle end downwards and by means of pressure by the fingers upon the pointed ends of the two nibs a and b the pressure upon the hook g and the under surface of the nut is released, so that the system of movable parts falls downwards until the screw threaded stem j' reaches the rear end of the slot e. 'l/Vhen the nibs of the pen are released the hooked part g passes freely through` the slot b so that the operation of cleaning can lbe performed. j

YAfter the pen has been cleaned the draughtsman holds the pen with the handle end downwards and pinches the pointed ends of the two nibs a and d close together so that the hooked part g passes through the-slot b. He then turns Athe drawing pen upside down, still keeping the nibs of the pen pinched together, so that the system of movable parts falls towards the points of the pen and the hooked part g passes into the gripping position.

lVhen released the nibs a and al spring part until the former thickness of line is again attained.

During the operations of opening, cleaning and closing the pen, the nut c does not need to be touched at all, but for this purpose six parts are necessary in the construction under notice, namely the two nibs of the pen, the set screw the adjusting nut lc, the guide bar h, and the guide pin c. In the pens now to be described the draughtsman is enabled to effect the said operation with four parts only.

In the drawing pen shown in Figs. 5, 6, 7 and 8, the hooked screw f', g Vis formed in one piece with the guide bar it.

CIK

The guide bar L which is tapered towards its rear end and is made from suitable sheet metal, has on its lower face, in addition to the hook g, a stop lug e, the adjusting screw f projectingl from its upper face opposite to the hook g. rl`he hook g is adapted to extend through the longitudinal slot b in the nib aof the pen. The said nib'ct is also formed with a second longitudinal slot c through which the lug 1l is adapted to extend.

The lug e" in conjunction with the slot c replaces-the guide pino in conjunction with thev recess t in the bar 7L of the pen of Figs.

l to 4. The manipulation of the pen lastV described is therefore effected in exactly the same manner as in the previously described arrangements.

In the pen shown in Figs. 9, l0 and 11, the guide bar h2 is not arranged between the two nibs of the pen. The screwk f2 is made in one piece with the hook g2, and is flattened in part by removing the screw thread on both sides, see Fig. l0. The end of the screw 72 projecting upwardly beyond the adjusting nut 702 extends-through a longitudinal slot 2 in a guide bar h2 whichis shaped as shown andvone endl of which is screwed to the upper nib Z2 of the pen. The adjusting nut is constructed in the form of a Aflat disc and is held between the slot ted part of the guide member h2 and the nib d2 by friction, so that it does not change its position contrary to the draughtsmans intention if the pen is Vaccidentally knocked.

The friction produced .influences the action in so far that it is not possible, by sim* ply pinching thenibs of the pen together, to render the hooked portion suiiiciently `movable as to render it capable of falling by its own weight so that it is necessary to apply pressure with the fingers either upon the hooked part g2 or upon the upper end of the-screw f2. Even in this case however the adjusting nut is not touched and consequently the hereinbefore mentioned advantages are still attained.

iVhat l claim is 1. vIn an oblong drawing pen, two nibs each having a slot therein, an adjusting screw extending through said slots, a head on said screw engaging the edge of the slot in one of said nibs, a guide bar fixed to said screw, and means for holding said bar in iixed position.

in one of said nibs, a pin projecting fromv one of said nibs, between the said nibs, a slotted guide bar located between said nibs said bar being iixed on said screw and sliding on said pin, and an vadjusting nut on said screw.

4. ln a drawing pen,two nibs each formed with a slot, an adjusting screw extending through said slots and having a head arranged to` catchover one edge of the slot in one of said nibs, a guidevmember fixed on said screw having a'recess therein, a pin on one of said nibs engaging said recess, and an adjusting nut on said screw.

ln a drawing pen, two nibs each formed with a slot, an adjusting screwl extending through the slots of said nibs, ahead on saidscrew engaging theedge of thev slot in one of said nibs, a slotted guide Vmember fixed to said screw, a pin on one of said nibs engaging the slot in said guiderneinben and an adjusting nut'on said screw.y

G. in an oblong drawing pen, .two nibsV each formed with a slot, an adjusting 'screw extending through the slots of. said Vnibs, a head on said screw engaging the edge of the slot in one'of said nibs, guideV member fixed to said screw and located between said.

nibs, and an adjusting nut `on said screw.

T. [n a drawing pen, ltwo nibs each formed with a slot, an adjusting screw` extending through the slots of said nibs, a head on said screw.` engaging the edge of the slot in one of said nibs, a slidable guide member carried by said screw, and a part'fixed. to one of said nibs on which said guide member can slide.

n testimony whereof I, afiix my signature in presence of two witnesses.

GEORG SCHOENNER.

lNitnesses:

LnoNHARD KOERBER, FRITZ BENZ.

lOO 

